Magnetic epoxy nanocomposites with superparamagnetic MnFe2O4 nanoparticles

Abstract

Manganese iron oxide (MnFe2O4) nanoparticles successfully served as nanofillers for obtaining magnetic epoxy nanocomposites. The viscosities of MnFe2O4/epoxy resin liquid suspensions increased with increasing the nanoparticles loading except the suspension with 5.0 and 1.0 wt% loading, whose viscosities were lower than that of pure epoxy. The introduction of MnFe2O4 nanoparticles showed a lower onset decomposition temperature and glass transition temperature (Tg), which decreased with increasing the nanoparticles loading. The storage modulus and tensile strength of 1.0 wt% MnFe2O4/epoxy were a little higher than that of pure epoxy. The coercivity of MnFe2O4/epoxy nanocomposites with 5.0 wt% (44.7 Oe) and 10.0 wt% (43.9 Oe) displayed much higher than that of pure MnFe2O4 nanoparticles (14.94 Oe). The magnetic moment (m) of nanocomposites (1.354 μB for 10 wt% MnFe2O4/epoxy) are higher than that of pure MnFe2O4 nanoparticles (1.244 μB). The increased real permittivity observed in the nanocomposites was attributed to the interfacial polarization. The intrinsic permittivity of the MnFe2O4 nanoparticles was also calculated.

Synthesis and Characterization Unsaturated Polyester Resin Nanocomposites Reinforced by Fe2O3+ Ni Nanoparticles: Influence on Mechanical and Magnetic Properties

“…The saturation magnetization manifests the specimen's response to the external magnetic field, whereas the coercivity field represents the force necessary when the specimen is subjected to an external magnetic field that is the polar opposite of the initial external magnetic field. The coercivity field (Hc) is utilized to minimize the magnetization of the specimen and then the external magnetic field; the magnetization returns to the zero, while the residual magnetization is not reduced to zero [19].…”

Magnetic Nanofibers: Unique Properties, Fabrication Techniques, and Emerging Applications

“…When the volume of the magnetic particles or the volume of the magnetic domain is small enough to be disturbed by the thermal disturbances, their magnetism would be similar to that of atoms (the magnetic moment of the atoms is not zero). This phenomenon is called superparamagnetic …”

Kinetics and thermal properties of epoxy resins containing the ionic liquid [C6mim]FeCl4

“…They have been widely analysed in the elds of coatings, adhesives, composites, laminates and encapsulates. [1][2][3] As a classic engineered polymer, 4,5 epoxy resin has drawn attention due to the wide applications including in photocuring, 6 magnetoresistive materials, 7 magnetic materials, 8 and epoxy nanocomposites. They also have versatile physicochemical properties in otherwise inert polymers and can enhance the mechanical properties and reduce ammability.…”